Purification system for boilers



' 'LTS Jam.. 29, 129.

- J. osrEmjAG PUR'IFICATION SYSTEM FOR BOILERS Filled July v, 1922 75 bol/zr {saved/Oum? impurities.

Pareil-ted Jan. 2 9, 1929.-

ju Ni-TED STATES PATENT oFFicfE- JULI'Us osTERTAe, 'oF STUTTGART, GERMANY.

PURIFICATION SYSTEM FOR BOILERS. Appiication inea Juiy 7, 1922, serial ivo;

i The present invention relates to a method for the purpose of purifying and 'clearing liquids, particularlyboiler feed water.V

lIn all cases the employment of -aiilter is"v 5 very inconvenient and frequently for reasons 0i' space impossible, or the filter is not eia- Pbl 0f dl'IGSng the iinpuritiesin the water. y The present invention relates to-j a; method l that worllrs without a lilvter and eliminates all Moreover the4 known `Aarrangements'i for softening the water are not Veconomical inl working 'and do not ensure prevention of the formation of scale and sludge 'in boilers.

An arrangement for carrying out the method is illustrated in two forms in the drawing. y

Figs. l and 2 are diagrammatic representations in vertical Sectionof two forms of a conf' trivance for rendering the substances dissolved in the water harmless. Raw water is conveyed into an open receptacle l through a pipe 2. -The inflow-of crude water is regulated vloyi a valve 3 with float.

From a vessel 4 the necessary chemicals flow through a pipe 5 into the receptacle 11 (see Fig. l).

In the receptacle 1' the crude water andthe introduced chemicals mix. 'I-Iot water is conveyed to the apparatus l through a pipe 6, whereby the contents of the apparatus are, heated. The introduction of the hot boiler water into lthe receptacle ltakes pliice under pressure, whereby a further intensive mixing of different liquids is effected, and the slibstances causing hardness are quickly precipilated. The boiler feed water purified and freed from sludge is taken o'f through a pipe 7. i

vThe freeing of the water from the particles of Sludge carried along therewith -is effected without the assistance of a filter as inaccordance with the invention, the I'direction of movement of the water is altered.

Further, in thev apparatus l av conical bottoni 8 with an opening 9 is built. The softened water leaves. the upper part of the apparatus l and enters the lower part thereof through the opening 9. Immediately after passing through the opening 9 the Stream oi water takes an upward direction. e

The operation of the apparatus is as follows:

e Through the introduction of the hot boiler- 'eai'bonielaeidj orced out.

Water thel Vtemperature of the crude'water is increased yand thereby thevgases dissolved particularly the "'lightf-iiiijidilakes which have en, .nitrogen andA v'lhe *e gases escape niiinberless-small bubbles floating vbodiesv an d inA ris`-, -lfthat-i's init-heir path' been separated-1from*thefcrud'ejwater. In

vconsequence of this afrothy massffforinson the surface.` This consist-s of sludge-,and is carried by enclosed gas bubbles.` Byithe in.

troductiono the raw water the gas-bubbles I are continuously freed from what adheres to them (mud-flakes) and the sludge, `which through the described procedure has collect- 4'ed in large flakes can precipitate and passes through the opening 9 into the lower part of the receptacle l.

'Now as the sludge is Specifically heavier than' the lwater ,it does not-change its direc-v tion after passing through the opening 9, but

falls ina straightliiie further on to the low- -est point in the receptacle 1, ii'eiii'whieh it can be Alet ott'r from time to time through a cock or-.the'like into the sludge passage or channel. In consequence of this onlyy perfectly clear water can now come out oi" the pipe 7 and mud-Hakes which are spociiicallv lighter than the water can no longer enter the boiler with the purified water, as is the case' `frequently in other apparatus, because these ilalres.y in consequence oi their lightness rise to the surta-ce and stay there until they are encased by heavier sludge and sink. The

lessvigorous circulation of water will be conl tinuously effected.

water is that the sludge formed from the residiie of hardness cannot precipitate on the lowest point vin the boiler, butlike the'water is kept in continuous movement. Nowinor# der to get rid of this sludge, .before it has reached a dangerous extenta certain quantity of water of condensation containing sludge is carried off through the `pipe 6 into the receptacle 1. In this there is exactly thel The consequence of this circulation oit the.;

-1'5 much more quickly if so called centres of y saine percentage of sludge as there isin the water that is still in the boiler.

receptacle in' theknown manner at the l/ow- -to an auxiliary action,

- T hus in consequence of the continual carrying'off of. the sludgeany dangerous concentration thereof in the boilers is prevented.

The sludge carried on precipitates 'in the est point,` after beingpreviously subjected This auxiliary ac that the sludge intion consists in this viz troduced into theapparatus 1 with the hotv lboiler-water contributes to convert thesludge formers still in a soluble state'iiito an iiisoluble state.' -It is well known that substances in solution become insoluble or' crystallized crystallization are present'. The mudfi: kes

introduced with the hot boiler water may be regarded as such centres of crystallization.

Owing to thefact that the forced' out gases have a continuous tendency tov carry apor-v tion ofthe eliminated hardness'formers to the upper surface of the receptacle l, thev upper t: as'- far' as possible through 30 side the apparatus part of the receptacle is a space which is filled.

` sodaorv thelike. A complete precipitation the boiler' comes with the boilersludge waterv of the non-carbonate hardness however is only possible" by iii-'sing an excess of soda. This excess of soda enters vthe boiler with the fee'd water and is partially converted 'into caustic soda. *This caustic soda formed in coijitinuously back to .the 4purifier and acts irl-precipitating the residue ofthe carbonate hardness, which -is still present notwithstanding the intensive heating. In this way it is possible tosdften the fee'd water better4 and less expensively than according to known methods. One known method employs-linie for example for precipitating the carbonate hardness. As, however,v present application, the carbonatehardness is mainly precipitated' by heat which` is at once available without cost, and only the residue of hardness requires an additional medium which however, has only to be applied once, because the soda is continuously regenerated inthe boiler, the great advantage of the new method is shown very clearly.

In Fig, 2 another form' of construction of *the apparatus for carrying out the method is illustrated, the flow of the water being re versed.e

In this case raw water, chemicalsand hot means of two Y througha pipe according to the.

sludge water areintroduced into the lower l part of the o'penreceptacle 1, whilst the puriiied water rises throughethe opening 9 and enters the pipe A funnel or hopper shaped pieces of metall'll and 12arranged vone Vabove the other. rlhe rapidly rising gas bubbles, with 7. The opening is f orined by mud Hakes carried alongl therewith also rise in this case to the surface any escape of the saine with the `purified water being impossible.' The contactefect of the`sludge that is being deposited is greater 'in this arrangement than in the form of constructionshown ,in Fig. 1 because the sludge deposited at the lowest point i'n the receptacle 1 is continuouslyI stirred up again through the boilervwater flowing in y.under high pressure. The sludge separated from the water may` even beregarded as a filter, for'v in the/lower part of the receptacle 1 according to Fig. 2 in ashort ltime ajn increase, of mud-'flakes will form whichpreventf he lighter particles of mud Hakes r4,from rising. Chemicals are intro- 5; a funnel having'a pipe depending therefrom is used to'supply thev chemicals to the lower end, adjacent the incoming feed and boiler water. f

Ie'laim.: 1. In a method for continuously purifying boiler feed water during operation of a boiler, the steps of continuously blowing off sludgecontaining water fromlfth'e boiler, conducting the boiler make-up water into a region of low er pressure while maintaining its heat content, 'and there commingling it with 'boiler' feed ducedga's in the other form of the device,

ico

water containing make-up water,v the reducf c `tion in pressure of the blow-'olf water impartmakesup water for precipitating heat to the 'ing impurities, freeing the feed water from the impurities andgsludge,andfe'eding said puriicdlifeed water to the: boiler.

2. In a method for continuously vpurifying boil er feed water during operation of'a boiler, the steps of continuously blowing offsludgecontaining water the boiler blow-'ofi' water into a region of `l ower pressure while maintaining its heat content, aiid there commingling it with boiler.

feed water containing make-up water, chemically treating the boiler feed water, vhe reducfiom the boiler, conducting vtion in prcssureof the blow-off water impart- I ing -heat to the ing impurities, freeing the feed water from the impurities and sludge, and feeding said purified feed water to the boiler.

boiler feed water during operation of a boiler,

' the steps of feeding the boiler with feed water containing an excess of sodium carbonate, partially converting the sodium carbonate into causticpsoda in the boiler,

boiler, conducting the blow-off. water into a region of lower pressure whilemaintaining make;up water for precipitat- Iii a method for continuously purifying .I

A continuously blowing-off sludge-containing water from theits heat content, and there commingling it precipitating impuiities in the make-up with boilei` feed Water containing make-up Water due to non-carbonate hardness by inter- 10 Water, the reduction in pressure of the blowaction with sodium carbonate, freeing the Water impart-ing heat to the make-up feed 'water from the precipitated impurities '5 water, precipitating impui'itiesinthemake-up and sludge, and feeding sald purified feed water due to carbonate hardness by absorp- ,Water t0 the boiler. tion of said heat and by interaction Wththe In testimony whereof I afix my signature. caustic soda present in the blow-ofi' water, JULIUS OSTERTAG. [n s] 

